I got a pelvic X-Ray taken, and there's a ring-shaped circle looking thing on the left hip? What is it?

I got an X-Ray for my right hip to check my recovery from a surgery I had a while ago. I took a picture of the X-Ray and then noticed that on the left side, there was a ring-shaped circle... I have no idea what it is? Or if it's something to be concerned about?
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